Interview for Family Immigration

Hi everyone! I just received an email from the UDI, informing me and my husband to have an interview soon.
My questions are;
1. How long should I wait to have the interview?
2. After the interview, how many months can  we possibly got the answer of our application?
3. Is it me to be interviewed or my husband?(Most likely)
4. What possible questions we can have during the interview?
5. What possible documents we need to prepare?

I hope there's someone out there who have the same experience like ours could enlight our mind.
Thank you!

Greetings from Philippines!

Hi Erin, how did your visa application or interview went?